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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
In order not to worsen sunken eyelids and dark eye circles, it is crucial to increase iron in your diet. This can be sourced out from many foods; liver is just one of them. Cause #4: Vitamin K Deficiency. Vitamin K is the one responsible for blood clotting.